14.The Jonas Brothers in 2006.

Joe, Nick, and (sigh) Kevin, today.

15.Boyz II Men in 1992.

Ron Galella / WireImage

And Boyz II Men in 2015 performing on Grease Live.

Getty Images

16.New Edition in 1989.

Gab Archive / Redferns

...And New Edition in 2016.

Dave Kotinsky / Getty Images

Music Week is a week of content that celebrates the awesome classic jams, artists, and music videos you grew up with — as well as future classics. Take a step back in time and check out more great music content here.